A Database object represents a virtual connection to a database. The Database class is meant to be subclassed by database adapters in order to provide the functionality needed for executing queries.
This methods involve the Database’s connection pool.
The Database subclass for the given adapter scheme. Raises Sequel::AdapterNotFound if the adapter could not be loaded.
# File lib/sequel/database/connecting.rb, line 17 def self.adapter_class(scheme) scheme = scheme.to_s.gsub('-', '_').to_sym unless klass = ADAPTER_MAP[scheme] # attempt to load the adapter file begin Sequel.tsk_require "sequel/adapters/#{scheme}" rescue LoadError => e raise Sequel.convert_exception_class(e, AdapterNotFound) end # make sure we actually loaded the adapter unless klass = ADAPTER_MAP[scheme] raise AdapterNotFound, "Could not load #{scheme} adapter" end end klass end
Returns the scheme for the Database class.
# File lib/sequel/database/connecting.rb, line 37 def self.adapter_scheme @scheme end
Connects to a database. See Sequel.connect.
# File lib/sequel/database/connecting.rb, line 42 def self.connect(conn_string, opts = {}) case conn_string when String if match = /\A(jdbc|do):/.match(conn_string) c = adapter_class(match[1].to_sym) opts = {:uri=>conn_string}.merge(opts) else uri = URI.parse(conn_string) scheme = uri.scheme scheme = :dbi if scheme =~ /\Adbi-/ c = adapter_class(scheme) uri_options = c.send(:uri_to_options, uri) uri.query.split('&').collect{|s| s.split('=')}.each{|k,v| uri_options[k.to_sym] = v if k && !k.empty?} unless uri.query.to_s.strip.empty? uri_options.entries.each{|k,v| uri_options[k] = URI.unescape(v) if v.is_a?(String)} opts = uri_options.merge(opts) end when Hash opts = conn_string.merge(opts) c = adapter_class(opts[:adapter] || opts['adapter']) else raise Error, "Sequel::Database.connect takes either a Hash or a String, given: #{conn_string.inspect}" end # process opts a bit opts = opts.inject({}) do |m, kv| k, v = *kv k = :user if k.to_s == 'username' m[k.to_sym] = v m end begin db = c.new(opts) db.test_connection if opts[:test] && db.send(:typecast_value_boolean, opts[:test]) result = yield(db) if block_given? ensure if block_given? db.disconnect if db ::Sequel::DATABASES.delete(db) end end block_given? ? result : db end
Sets the default single_threaded mode for new databases. See Sequel.single_threaded=.
# File lib/sequel/database/connecting.rb, line 85 def self.single_threaded=(value) @@single_threaded = value end
Dynamically add new servers or modify server options at runtime. Also adds new servers to the connection pool. Intended for use with master/slave or shard configurations where it is useful to add new server hosts at runtime.
servers argument should be a hash with server name symbol keys and hash or proc values. If a servers key is already in use, it’s value is overridden with the value provided.
DB.add_servers(:f=>{:host=>"hash_host_f"})
# File lib/sequel/database/connecting.rb, line 119 def add_servers(servers) @opts[:servers] = @opts[:servers] ? @opts[:servers].merge(servers) : servers @pool.add_servers(servers.keys) end
Connects to the database. This method should be overridden by descendants.
# File lib/sequel/database/connecting.rb, line 125 def connect(server) raise NotImplemented, "#connect should be overridden by adapters" end
The database type for this database object, the same as the adapter scheme by default. Should be overridden in adapters (especially shared adapters) to be the correct type, so that even if two separate Database objects are using different adapters you can tell that they are using the same database type. Even better, you can tell that two Database objects that are using the same adapter are connecting to different database types (think JDBC or DataObjects).
# File lib/sequel/database/connecting.rb, line 136 def database_type self.class.adapter_scheme end
Disconnects all available connections from the connection pool. Any connections currently in use will not be disconnected. Options:
:servers - Should be a symbol specifing the server to disconnect from, or an array of symbols to specify multiple servers.
# File lib/sequel/database/connecting.rb, line 144 def disconnect(opts = {}) pool.disconnect(opts) end
Yield a new database object for every server in the connection pool. Intended for use in sharded environments where there is a need to make schema modifications (DDL queries) on each shard.
DB.each_server{|db| db.create_table(:users){primary_key :id; String :name}}
# File lib/sequel/database/connecting.rb, line 153 def each_server(&block) servers.each{|s| self.class.connect(server_opts(s), &block)} end
Dynamically remove existing servers from the connection pool. Intended for use with master/slave or shard configurations where it is useful to remove existing server hosts at runtime.
servers should be symbols or arrays of symbols. If a nonexistent server is specified, it is ignored. If no servers have been specified for this database, no changes are made. If you attempt to remove the :default server, an error will be raised.
DB.remove_servers(:f1, :f2)
# File lib/sequel/database/connecting.rb, line 167 def remove_servers(*servers) if @opts[:servers] && !@opts[:servers].empty? servs = @opts[:servers].dup servers.flatten! servers.each{|s| servs.delete(s)} @opts[:servers] = servs @pool.remove_servers(servers) end end
An array of servers/shards for this Database object.
# File lib/sequel/database/connecting.rb, line 178 def servers pool.servers end
Returns true if the database is using a single-threaded connection pool.
# File lib/sequel/database/connecting.rb, line 183 def single_threaded? @single_threaded end
This methods affect relating to the logging of executed SQL.
Numeric specifying the duration beyond which queries are logged at warn level instead of info level.
Log a message at level info to all loggers.
# File lib/sequel/database/logging.rb, line 16 def log_info(message, args=nil) log_each(:info, args ? "#{message}; #{args.inspect}" : message) end
Yield to the block, logging any errors at error level to all loggers, and all other queries with the duration at warn or info level.
# File lib/sequel/database/logging.rb, line 22 def log_yield(sql, args=nil) return yield if @loggers.empty? sql = "#{sql}; #{args.inspect}" if args start = Time.now begin yield rescue => e log_each(:error, "#{e.class}: #{e.message.strip}: #{sql}") raise ensure log_duration(Time.now - start, sql) unless e end end
These methods all return instances of this database’s dataset class.
Returns a dataset from the database. If the first argument is a string, the method acts as an alias for Database#fetch, returning a dataset for arbitrary SQL:
DB['SELECT * FROM items WHERE name = ?', my_name].all
Otherwise, acts as an alias for Database#from, setting the primary table for the dataset:
DB[:items].sql #=> "SELECT * FROM items"
# File lib/sequel/database/dataset.rb, line 18 def [](*args) (String === args.first) ? fetch(*args) : from(*args) end
Returns a blank dataset for this database
# File lib/sequel/database/dataset.rb, line 23 def dataset ds = Sequel::Dataset.new(self) end
Fetches records for an arbitrary SQL statement. If a block is given, it is used to iterate over the records:
DB.fetch('SELECT * FROM items'){|r| p r}
The method returns a dataset instance:
DB.fetch('SELECT * FROM items').all
Fetch can also perform parameterized queries for protection against SQL injection:
DB.fetch('SELECT * FROM items WHERE name = ?', my_name).all
# File lib/sequel/database/dataset.rb, line 40 def fetch(sql, *args, &block) ds = dataset.with_sql(sql, *args) ds.each(&block) if block ds end
This methods generally execute SQL code on the database server.
Runs the supplied SQL statement string on the database server. Alias for run.
# File lib/sequel/database/query.rb, line 29 def <<(sql) run(sql) end
Call the prepared statement with the given name with the given hash of arguments.
# File lib/sequel/database/query.rb, line 35 def call(ps_name, hash={}) prepared_statements[ps_name].call(hash) end
Executes the given SQL on the database. This method should be overridden in descendants. This method should not be called directly by user code.
# File lib/sequel/database/query.rb, line 41 def execute(sql, opts={}) raise NotImplemented, "#execute should be overridden by adapters" end
Method that should be used when submitting any DDL (Data Definition Language) SQL. By default, calls execute_dui. This method should not be called directly by user code.
# File lib/sequel/database/query.rb, line 48 def execute_ddl(sql, opts={}, &block) execute_dui(sql, opts, &block) end
Method that should be used when issuing a DELETE, UPDATE, or INSERT statement. By default, calls execute. This method should not be called directly by user code.
# File lib/sequel/database/query.rb, line 55 def execute_dui(sql, opts={}, &block) execute(sql, opts, &block) end
Method that should be used when issuing a INSERT statement. By default, calls execute_dui. This method should not be called directly by user code.
# File lib/sequel/database/query.rb, line 62 def execute_insert(sql, opts={}, &block) execute_dui(sql, opts, &block) end
Returns a single value from the database, e.g.:
# SELECT 1 DB.get(1) #=> 1 # SELECT version() DB.get(:version.sql_function) #=> ...
# File lib/sequel/database/query.rb, line 73 def get(*args, &block) dataset.get(*args, &block) end
Return a hash containing index information. Hash keys are index name symbols. Values are subhashes with two keys, :columns and :unique. The value of :columns is an array of symbols of column names. The value of :unique is true or false depending on if the index is unique.
Should not include the primary key index, functional indexes, or partial indexes.
# File lib/sequel/database/query.rb, line 83 def indexes(table, opts={}) raise NotImplemented, "#indexes should be overridden by adapters" end
Parse the schema from the database. Returns the schema for the given table as an array with all members being arrays of length 2, the first member being the column name, and the second member being a hash of column information. Available options are:
:reload - Get fresh information from the database, instead of using cached information. If table_name is blank, :reload should be used unless you are sure that schema has not been called before with a table_name, otherwise you may only getting the schemas for tables that have been requested explicitly.
:schema - An explicit schema to use. It may also be implicitly provided via the table name.
# File lib/sequel/database/query.rb, line 107 def schema(table, opts={}) raise(Error, 'schema parsing is not implemented on this database') unless respond_to?(:schema_parse_table, true) sch, table_name = schema_and_table(table) quoted_name = quote_schema_table(table) opts = opts.merge(:schema=>sch) if sch && !opts.include?(:schema) @schemas.delete(quoted_name) if opts[:reload] return @schemas[quoted_name] if @schemas[quoted_name] cols = schema_parse_table(table_name, opts) raise(Error, 'schema parsing returned no columns, table probably doesn\t exist') if cols.nil? || cols.empty? cols.each{|_,c| c[:ruby_default] = column_schema_to_ruby_default(c[:default], c[:type])} @schemas[quoted_name] = cols end
Returns true if a table with the given name exists. This requires a query to the database.
# File lib/sequel/database/query.rb, line 125 def table_exists?(name) begin from(name).first true rescue false end end
Return all tables in the database as an array of symbols.
# File lib/sequel/database/query.rb, line 135 def tables(opts={}) raise NotImplemented, "#tables should be overridden by adapters" end
Starts a database transaction. When a database transaction is used, either all statements are successful or none of the statements are successful. Note that MySQL MyISAM tabels do not support transactions.
The following options are respected:
:server - The server to use for the transaction
:savepoint - Whether to create a new savepoint for this transaction, only respected if the database adapter supports savepoints. By default Sequel will reuse an existing transaction, so if you want to use a savepoint you must use this option.
# File lib/sequel/database/query.rb, line 150 def transaction(opts={}, &block) synchronize(opts[:server]) do |conn| return yield(conn) if already_in_transaction?(conn, opts) _transaction(conn, &block) end end
These methods execute code on the database that modifies the database’s schema.
Adds a column to the specified table. This method expects a column name, a datatype and optionally a hash with additional constraints and options:
DB.add_column :items, :name, :text, :unique => true, :null => false DB.add_column :items, :category, :text, :default => 'ruby'
See alter_table.
# File lib/sequel/database/schema_methods.rb, line 30 def add_column(table, *args) alter_table(table) {add_column(*args)} end
Adds an index to a table for the given columns:
DB.add_index :posts, :title DB.add_index :posts, [:author, :title], :unique => true
Options:
:ignore_errors - Ignore any DatabaseErrors that are raised
See alter_table.
# File lib/sequel/database/schema_methods.rb, line 44 def add_index(table, columns, options={}) e = options[:ignore_errors] begin alter_table(table){add_index(columns, options)} rescue DatabaseError raise unless e end end
Alters the given table with the specified block. Example:
DB.alter_table :items do add_column :category, :text, :default => 'ruby' drop_column :category rename_column :cntr, :counter set_column_type :value, :float set_column_default :value, :float add_index [:group, :category] drop_index [:group, :category] end
Note that add_column accepts all the options available for column definitions using create_table, and add_index accepts all the options available for index definition.
See Schema::AlterTableGenerator and the “Migrations and Schema Modification” guide.
# File lib/sequel/database/schema_methods.rb, line 70 def alter_table(name, generator=nil, &block) generator ||= Schema::AlterTableGenerator.new(self, &block) alter_table_sql_list(name, generator.operations).flatten.each {|sql| execute_ddl(sql)} remove_cached_schema(name) nil end
Creates a view, replacing it if it already exists:
DB.create_or_replace_view(:cheap_items, "SELECT * FROM items WHERE price < 100") DB.create_or_replace_view(:ruby_items, DB[:items].filter(:category => 'ruby'))
# File lib/sequel/database/schema_methods.rb, line 115 def create_or_replace_view(name, source) source = source.sql if source.is_a?(Dataset) execute_ddl("CREATE OR REPLACE VIEW #{quote_schema_table(name)} AS #{source}") remove_cached_schema(name) nil end
Creates a table with the columns given in the provided block:
DB.create_table :posts do primary_key :id column :title, :text String :content index :title end
Options:
:temp - Create the table as a temporary table.
:ignore_index_errors - Ignore any errors when creating indexes.
See Schema::Generator and the “Migrations and Schema Modification” guide.
# File lib/sequel/database/schema_methods.rb, line 91 def create_table(name, options={}, &block) remove_cached_schema(name) options = {:generator=>options} if options.is_a?(Schema::Generator) generator = options[:generator] || Schema::Generator.new(self, &block) create_table_from_generator(name, generator, options) create_table_indexes_from_generator(name, generator, options) nil end
Forcibly creates a table, attempting to drop it unconditionally (and catching any errors), then creating it.
# File lib/sequel/database/schema_methods.rb, line 101 def create_table!(name, options={}, &block) drop_table(name) rescue nil create_table(name, options, &block) end
Creates the table unless the table already exists
# File lib/sequel/database/schema_methods.rb, line 107 def create_table?(name, options={}, &block) create_table(name, options, &block) unless table_exists?(name) end
Creates a view based on a dataset or an SQL string:
DB.create_view(:cheap_items, "SELECT * FROM items WHERE price < 100") DB.create_view(:ruby_items, DB[:items].filter(:category => 'ruby'))
# File lib/sequel/database/schema_methods.rb, line 126 def create_view(name, source) source = source.sql if source.is_a?(Dataset) execute_ddl("CREATE VIEW #{quote_schema_table(name)} AS #{source}") end
Removes a column from the specified table:
DB.drop_column :items, :category
See alter_table.
# File lib/sequel/database/schema_methods.rb, line 136 def drop_column(table, *args) alter_table(table) {drop_column(*args)} end
Removes an index for the given table and column/s:
DB.drop_index :posts, :title DB.drop_index :posts, [:author, :title]
See alter_table.
# File lib/sequel/database/schema_methods.rb, line 146 def drop_index(table, columns, options={}) alter_table(table){drop_index(columns, options)} end
Drops one or more tables corresponding to the given names:
DB.drop_table(:posts, :comments)
# File lib/sequel/database/schema_methods.rb, line 153 def drop_table(*names) names.each do |n| execute_ddl(drop_table_sql(n)) remove_cached_schema(n) end nil end
Drops one or more views corresponding to the given names:
DB.drop_view(:cheap_items)
# File lib/sequel/database/schema_methods.rb, line 164 def drop_view(*names) names.each do |n| execute_ddl("DROP VIEW #{quote_schema_table(n)}") remove_cached_schema(n) end nil end
Dump indexes for all tables as a migration. This complements the :indexes=>false option to dump_schema_migration. Options:
:same_db - Create a dump for the same database type, so don’t ignore errors if the index statements fail.
# File lib/sequel/extensions/schema_dumper.rb, line 13 def dump_indexes_migration(options={}) ts = tables(options) Sequel.migration do up do#{ts.sort_by{|t| t.to_s}.map{|t| dump_table_indexes(t, :add_index, options)}.reject{|x| x == ''}.join("\n\n").gsub(/^/o, ' ')} end down do#{ts.sort_by{|t| t.to_s}.map{|t| dump_table_indexes(t, :drop_index, options)}.reject{|x| x == ''}.join("\n\n").gsub(/^/o, ' ')} endend end
Return a string that contains a Sequel::Migration subclass that when run would recreate the database structure. Options:
:same_db - Don’t attempt to translate database types to ruby types. If this isn’t set to true, all database types will be translated to ruby types, but there is no guarantee that the migration generated will yield the same type. Without this set, types that aren’t recognized will be translated to a string-like type.
:indexes - If set to false, don’t dump indexes (they can be added later via dump_index_migration).
# File lib/sequel/extensions/schema_dumper.rb, line 37 def dump_schema_migration(options={}) ts = tables(options) Sequel.migration do up do#{ts.sort_by{|t| t.to_s}.map{|t| dump_table_schema(t, options)}.join("\n\n").gsub(/^/o, ' ')} end down do drop_table(#{ts.sort_by{|t| t.to_s}.inspect[1...-1]}) endend end
Return a string with a create table block that will recreate the given table’s schema. Takes the same options as dump_schema_migration.
# File lib/sequel/extensions/schema_dumper.rb, line 54 def dump_table_schema(table, options={}) table = table.value.to_s if table.is_a?(SQL::Identifier) raise(Error, "must provide table as a Symbol, String, or Sequel::SQL::Identifier") unless [String, Symbol].any?{|c| table.is_a?(c)} s = schema(table).dup pks = s.find_all{|x| x.last[:primary_key] == true}.map{|x| x.first} options = options.merge(:single_pk=>true) if pks.length == 1 m = method(:column_schema_to_generator_opts) im = method(:index_to_generator_opts) begin indexes = indexes(table).sort_by{|k,v| k.to_s} if options[:indexes] != false rescue Sequel::NotImplemented nil end gen = Schema::Generator.new(self) do s.each{|name, info| send(*m.call(name, info, options))} primary_key(pks) if !@primary_key && pks.length > 0 indexes.each{|iname, iopts| send(:index, iopts[:columns], im.call(table, iname, iopts))} if indexes end commands = [gen.dump_columns, gen.dump_constraints, gen.dump_indexes].reject{|x| x == ''}.join("\n\n") "create_table(#{table.inspect}#{', :ignore_index_errors=>true' if !options[:same_db] && options[:indexes] != false && indexes && !indexes.empty?}) do\n#{commands.gsub(/^/o, ' ')}\nend" end
Return a dataset modified by the query block
# File lib/sequel/extensions/query.rb, line 8 def query(&block) dataset.query(&block) end
Renames a column in the specified table. This method expects the current column name and the new column name:
DB.rename_column :items, :cntr, :counter
See alter_table.
# File lib/sequel/database/schema_methods.rb, line 189 def rename_column(table, *args) alter_table(table) {rename_column(*args)} end
Renames a table:
DB.tables #=> [:items] DB.rename_table :items, :old_items DB.tables #=> [:old_items]
# File lib/sequel/database/schema_methods.rb, line 177 def rename_table(name, new_name) execute_ddl(rename_table_sql(name, new_name)) remove_cached_schema(name) nil end
Sets the default value for the given column in the given table:
DB.set_column_default :items, :category, 'perl!'
See alter_table.
# File lib/sequel/database/schema_methods.rb, line 198 def set_column_default(table, *args) alter_table(table) {set_column_default(*args)} end
Set the data type for the given column in the given table:
DB.set_column_type :items, :price, :float
See alter_table.
# File lib/sequel/database/schema_methods.rb, line 207 def set_column_type(table, *args) alter_table(table) {set_column_type(*args)} end
This methods change the default behavior of this database’s datasets.
The method to call on identifiers going into the database
# File lib/sequel/database/dataset_defaults.rb, line 18 def self.identifier_input_method @@identifier_input_method end
Set the method to call on identifiers going into the database See Sequel.identifier_input_method=.
# File lib/sequel/database/dataset_defaults.rb, line 24 def self.identifier_input_method=(v) @@identifier_input_method = v || "" end
The method to call on identifiers coming from the database
# File lib/sequel/database/dataset_defaults.rb, line 29 def self.identifier_output_method @@identifier_output_method end
Set the method to call on identifiers coming from the database See Sequel.identifier_output_method=.
# File lib/sequel/database/dataset_defaults.rb, line 35 def self.identifier_output_method=(v) @@identifier_output_method = v || "" end
Sets the default quote_identifiers mode for new databases. See Sequel.quote_identifiers=.
# File lib/sequel/database/dataset_defaults.rb, line 41 def self.quote_identifiers=(value) @@quote_identifiers = value end
The method to call on identifiers going into the database
# File lib/sequel/database/dataset_defaults.rb, line 49 def identifier_input_method case @identifier_input_method when nil @identifier_input_method = @opts.fetch(:identifier_input_method, (@@identifier_input_method.nil? ? identifier_input_method_default : @@identifier_input_method)) @identifier_input_method == "" ? nil : @identifier_input_method when "" nil else @identifier_input_method end end
Set the method to call on identifiers going into the database
# File lib/sequel/database/dataset_defaults.rb, line 62 def identifier_input_method=(v) reset_schema_utility_dataset @identifier_input_method = v || "" end
The method to call on identifiers coming from the database
# File lib/sequel/database/dataset_defaults.rb, line 68 def identifier_output_method case @identifier_output_method when nil @identifier_output_method = @opts.fetch(:identifier_output_method, (@@identifier_output_method.nil? ? identifier_output_method_default : @@identifier_output_method)) @identifier_output_method == "" ? nil : @identifier_output_method when "" nil else @identifier_output_method end end
Set the method to call on identifiers coming from the database
# File lib/sequel/database/dataset_defaults.rb, line 81 def identifier_output_method=(v) reset_schema_utility_dataset @identifier_output_method = v || "" end
Whether to quote identifiers (columns and tables) for this database
# File lib/sequel/database/dataset_defaults.rb, line 87 def quote_identifiers=(v) reset_schema_utility_dataset @quote_identifiers = v end
Returns true if the database quotes identifiers.
# File lib/sequel/database/dataset_defaults.rb, line 93 def quote_identifiers? return @quote_identifiers unless @quote_identifiers.nil? @quote_identifiers = @opts.fetch(:quote_identifiers, (@@quote_identifiers.nil? ? quote_identifiers_default : @@quote_identifiers)) end
These methods don’t fit neatly into another category.
Constructs a new instance of a database connection with the specified options hash.
Sequel::Database is an abstract class that is not useful by itself.
Takes the following options:
:default_schema : The default schema to use, should generally be nil
:disconnection_proc: A proc used to disconnect the connection.
:identifier_input_method: A string method symbol to call on identifiers going into the database
:identifier_output_method: A string method symbol to call on identifiers coming from the database
:loggers : An array of loggers to use.
:quote_identifiers : Whether to quote identifiers
:single_threaded : Whether to use a single-threaded connection pool
All options given are also passed to the ConnectionPool. If a block is given, it is used as the connection_proc for the ConnectionPool.
# File lib/sequel/database/misc.rb, line 38 def initialize(opts = {}, &block) @opts ||= opts @opts = connection_pool_default_options.merge(@opts) @loggers = Array(@opts[:logger]) + Array(@opts[:loggers]) self.log_warn_duration = @opts[:log_warn_duration] @opts[:disconnection_proc] ||= proc{|conn| disconnect_connection(conn)} block ||= proc{|server| connect(server)} @opts[:servers] = {} if @opts[:servers].is_a?(String) @opts[:single_threaded] = @single_threaded = typecast_value_boolean(@opts.fetch(:single_threaded, @@single_threaded)) @schemas = {} @default_schema = @opts.fetch(:default_schema, default_schema_default) @prepared_statements = {} @transactions = [] @identifier_input_method = nil @identifier_output_method = nil @quote_identifiers = nil @pool = ConnectionPool.get_pool(@opts, &block) ::Sequel::DATABASES.push(self) end
Cast the given type to a literal type
# File lib/sequel/database/misc.rb, line 61 def cast_type_literal(type) type_literal(:type=>type) end
Returns a string representation of the database object including the class name and the connection URI (or the opts if the URI cannot be constructed).
# File lib/sequel/database/misc.rb, line 68 def inspect "#<#{self.class}: #{(uri rescue opts).inspect}>" end
Proxy the literal call to the dataset, used for default values.
# File lib/sequel/database/misc.rb, line 73 def literal(v) schema_utility_dataset.literal(v) end
Default serial primary key options.
# File lib/sequel/database/misc.rb, line 78 def serial_primary_key_options {:primary_key => true, :type => Integer, :auto_increment => true} end
Whether the database and adapter support savepoints, false by default
# File lib/sequel/database/misc.rb, line 83 def supports_savepoints? false end
Typecast the value to the given column_type. Calls typecast_value_#{column_type} if the method exists, otherwise returns the value. This method should raise Sequel::InvalidValue if assigned value is invalid.
# File lib/sequel/database/misc.rb, line 92 def typecast_value(column_type, value) return nil if value.nil? meth = "typecast_value_#{column_type}" begin respond_to?(meth, true) ? send(meth, value) : value rescue ArgumentError, TypeError => e raise Sequel.convert_exception_class(e, InvalidValue) end end
Returns the URI identifying the database. This method can raise an error if the database used options instead of a connection string.
# File lib/sequel/database/misc.rb, line 105 def uri uri = URI::Generic.new( self.class.adapter_scheme.to_s, nil, @opts[:host], @opts[:port], nil, "/#{@opts[:database]}", nil, nil, nil ) uri.user = @opts[:user] uri.password = @opts[:password] if uri.user uri.to_s end
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